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This was inspired by A curious case of Benjamin Button but has a different solution.

In 1980 AD (or 1980 CE, if you prefer), Jack has an age of 20. In 1985 however, he is only 6 years old.

How did Jack age backwards?

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Jack is 20 months old in 1980.

He is 6 years old in 1985.

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He was born on leap day, Feb 29 1960. So in 1980 his legal age would be 20, but by 1985 only 6 additional leap years have occurred.

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    $\begingroup$ The wording would have to be "he has only had 6 birthdays". If the anniversery is skipped a year has still passed. $\endgroup$ – kaine Oct 3 '14 at 20:23
  • $\begingroup$ This is a good solution, but it is not the one I had intended. $\endgroup$ – Chris Sunami supports Monica Oct 3 '14 at 20:24
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Jack is a fictional character first published in 1979. In the story is set in 1980 (or the sequel published 1980 or something), he is a 20 year old.

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